Nearly 15,000 enrollment records from Americans trying to sign up for Obamacare never made it to insurers — but the federal government does not know which records never made it to which insurer.

The federal analysis merely compares the number of times Obamacare enrollees clicked “enroll” to the number of plans HealthCare.gov sent to insurers, according to The Washington Post. Consumers who send the vanishing enrollments, or “orphan files,” are not notified that their information has not been processed and an insurer did not receive sensitive financial and health-related data, meaning that they could be in for an unpleasant surprise when the Dec. 23 deadline — the last day for customers to sign up for health insurance — comes and goes.

But government officials insist that less than one percent of enrollments disappeared into cyberspace since early December, even though their data does not include duplicated and erroneous enrollments.